Process of dyeing yarn.



- UNITED STATES PATE OFFIC :T'i

ARTHUR SCI-ILEGEL, OF MANNHEIM, GERMANY, ASSIGNOR TO BADISCHE ANILIN & SODA FABRIK, OF LUDWIGSHAFEN-ON-THE-RHINE, GERMANY, A CORPORATION.

PROCESS OF DYEING YARN.

No Drawing.

To all whom it may concern:

. Be it known that I, ARTHUR SGnLnoEL, subject of the German Emperor, residing at- Mannheim, Germany, have invented new and useful Improvements in Processes of Dyeing Yarn, of which the following is a specification.

an alkaline reducing agent. In carrying out the process described in the said specification the coloring matter is first only mechanically retained on the cotton and then,

during the subsequent treatment with the alkaline reducing agent, it is apparently reduced to the leuco compound and in this state is fixed to the cotton.

I have found that this improved process can be applied with success to yarn and even to such yarn as is exceptionally tightly wound, or strongly mercerized, and very level and well penetrated dyeings can be obtained. This result is of great technical importance 'and is especially valuable when coloring matters are employed which, when used according to the ordinary dyeing protesses, fix themselves on the surface of the fiber leaving the interior thereof more or less uncolored. The paste containing the Specification of Letters Patent.

Patented June 6, 1916.

Application filed November 3, 1911. Serial No.658,385.

indanthrene or other coloring matter can be prepared, for instance, as described in the aforesaid specification of Patent No. 898,384, and is applied to the yarn, either by working in the bath and then wringing, or by treatment in any suitable machine, such for instance as a machine of the kind employed for oiling, or mercerizing the yarn. The development and fixing of the coloring matter on the yarn is afterward effected with an alkaline reducing agent such for instance as alkaline hydrosulfite, as described in the aforesaid specification of Patent No. 893,384.

Now what I claim is v 1. The process of producing stable and even dyeings which consists in working yarn in 'a bath containing a vat coloring matter of the anthracene series, then pressing and treating itwith an alkaline reducing agent.

2. The process of producing stable and even dyeings which consists in Working yarn'in a bath containing a vat coloring matter of the anthracene series, then press- .ing and treating it with alkaline hydrosul- ARTHUR SCHLEGEL. Witnesses J. Anne. LLOYD, JOSEP'I Hnirrnn; 

